The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Michigan State GPS Network - NSCI-MSU Natural Sciences P.S.
Start: 19-Jun-2019
End: 14-Nov-2022
Freymueller, Jeffrey T., 2019, Michigan State GPS Network - NSCI-MSU Natural Sciences P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/61WJ-5H24